Cabildo Patio Feria is a lovely festival to go to while sightseeing in the Plaza de Mayo area. It is held on Thursday and Friday from 11:00am to 6:00pm in the small garden patio behind the Cabildo, or old city hall. You'll find lots of locally made crafts here, especially pottery, stained glass, and jewelry. It’s also a nice place to relax and people-watch.